Mac
Noun: a name used to call someone on a casual basis when the person does not know the other person's name.

Book example: "The driver was sort of a wise guy. 'I can't turn around here, Mac. This here's a one-way.'"
My example: After I finished my drink at the bar, I gave the bar-tender the bill and said, "thanks for the drink Mac."

Syn: bud, buddy, bro, man

Stephen Golz p.7